Reminds me of the time I emailed a HN discussion to a friend in an adjacent room in the office. She hit the link and then closed it in a panic as soon as she noticed the word "Hacker" in the tab title.
Isn't this the problem that DKIM is supposed to solve?
Not really...
If you don't want to confuse people when you sign your e-mail, make sure you're using PGP/MIME not inline signing. I've been signing my mail for years and had almost zero problems doing this.
unfortunately a lot of my mails got deleted by the recipients, because there were "some very strange things" (the signature) at the end of my mails and they were afraid of malware like viruses or trojans.
i wanted to increase the level of trust in my messages and achieved the complete opposite.
i stopped signing my mails a couple of weeks later, after a clients secretary phoned me to inform me "i had a virus on my computer".